固体火箭发动机的三维仿真研究动态

Research Trend in Three-dimension Simulation for the Solid Rocket Motor

固体火箭发动机的燃烧过程存在强烈的耦合和非线性现象,目前国内外对其仿真大多采用简单的一维仿真,而美国的高级火箭仿真中心(CSAR)正在开发三维的、完全耦合的固体火箭发动机仿真软件。详细介绍了它的第二代仿真软件GEN2的程序结构、算法及其测试结果,它采用任意拉格朗日/欧拉(ALE)形式的流体和固相控制方程分别求解流场和结构的变形和移动;采用显式的或隐式的时间步迭代法来实现流体/结构间的耦合;应用粘性/体积有限元(CVFE)方案模拟界面间裂纹的动态扩展。测试结果表明:GEN2具有很好的并行可量测性。

There must be strong coupled and nonlinear phenomena in the course of the combustion in the solid rocketmotor. One-dimension simulation is mostly used for solid rocket motor both inside and outside the country at present.However, the Center for Simulation of Advanced Rockets w （CSAR） in the United States is developing a three-dimension and full - coupled simulation software for solid rocket motor.Its second -generation simulation software, GEN2, is introduced in detail in the program structure, algorism and test results inthis paper. An Arbitrary Lagrangian/Eulerian （ALE） formulation is adopted for the fluid and solid governing equations toaccount for the motion and deformations of the flow field and structure. An explicit or implicit iterationscheme at each time step is used to solve the fluid-structure coupling. The cohesive/volumetric finite element （CVFE） scheme isdeveloped to model the dynamic propagation of theinterfacial crack. The test results indicate the perfect parallel scalability of GEN2.